Cross-sectional data reveal an apparent decline in the size of the lean body mass (LBM) during the adult years. We present longitudinal data on LBM as estimated by 40K counting, which show that this decline is for the most part biologic rather than secular in origin. The average rate of loss is about 3 kg per decade.
Forbes, Gilbert and Halloran, Eulalia
"The Adult Decline in Lean Body Mass,"
1, Article 14.
Available at: https://digitalcommons.wayne.edu/humbiol/vol48/iss1/14